Here you can find the source of atoi(Object s)
public static int atoi(Object s)
//package com.java2s; /*//from w w w . j a v a 2 s . c o m * * ==================================================================== * * The P6Spy Software License, Version 1.1 * * This license is derived and fully compatible with the Apache Software * license, see http://www.apache.org/LICENSE.txt * * Copyright (c) 2001-2002 Andy Martin, Ph.D. and Jeff Goke * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "The original concept and code base for P6Spy was conceived * and developed by Andy Martin, Ph.D. who generously contribued * the first complete release to the public under this license. * This product was due to the pioneering work of Andy * that began in December of 1995 developing applications that could * seamlessly be deployed with minimal effort but with dramatic results. * This code is maintained and extended by Jeff Goke and with the ideas * and contributions of other P6Spy contributors. * (http://www.p6spy.com)" * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "P6Spy", "Jeff Goke", and "Andy Martin" must not be used * to endorse or promote products derived from this software without * prior written permission. For written permission, please contact * license@p6spy.com. * * 5. Products derived from this software may not be called "P6Spy" * nor may "P6Spy" appear in their names without prior written * permission of Jeff Goke and Andy Martin. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ public class Main { public static int atoi(Object s) { int i = 0; if (s != null) { String n = s.toString(); int dot = n.indexOf('.'); if (dot != -1) { n = n.substring(0, dot); } try { i = new Integer(n).intValue(); } catch (NumberFormatException e) { i = 0; } } return (i); } }